St. Mary's 12 Volt Heated Electric Bunk Mattress Pad 30x60 In. 3 Comfort Settings Great For Use With RV's Boats Vans Trucks Etc. Comes With Clear Zip Storage Bag I've Tested This Pad And It Heats Nicely I Noticed That The Power Plug Did Fit A Bit Tight in My Particular Vehicles 12V Socket, Comes From A Non Smoking Home.